you can also just extract the videos in MPEG-2 format by using the "Capture" option, which all good Video Editing softwares has.
Capturing a video from DVD in MPEG-2 format takes almost no time, you get the video in its original form, no losses, and in a format which is very easy to edit in video editors.
on the other hand if one rips a DVD in MPEG-2 format using a DVD Ripper, it will take a long long time.
So the fastest way to extract a video from DVD is to Capture it in its native format. I use PowerDirector, which is a very simple yet a very handy video editing and rendering software.
Another good thing in capturing the video in MPEG-2 format is that it will take you less time to create a DVD after you have done with editing, since you will not have to convert the videos.